arch/x86/include/asm/mshyperv.h

   1 #ifndef _ASM_X86_MSHYPER_H
   2 #define _ASM_X86_MSHYPER_H
   3
   4 #include <linux/types.h>
   5 #include <linux/interrupt.h>
   6 #include <asm/hyperv.h>
   7
   8 struct ms_hyperv_info {
   9         u32 features;
  10         u32 misc_features;
  11         u32 hints;
  12 };
  13
  14 extern struct ms_hyperv_info ms_hyperv;
  15
  16 /*
  17  * Declare the MSR used to setup pages used to communicate with the hypervisor.
  18  */
  19 union hv_x64_msr_hypercall_contents {
  20         u64 as_uint64;
  21         struct {
  22                 u64 enable:1;
  23                 u64 reserved:11;
  24                 u64 guest_physical_address:52;
  25         };
  26 };
  27
  28 /*
  29  * The guest OS needs to register the guest ID with the hypervisor.
  30  * The guest ID is a 64 bit entity and the structure of this ID is
  31  * specified in the Hyper-V specification:
  32  *
  33  * msdn.microsoft.com/en-us/library/windows/hardware/ff542653%28v=vs.85%29.aspx
  34  *
  35  * While the current guideline does not specify how Linux guest ID(s)
  36  * need to be generated, our plan is to publish the guidelines for
  37  * Linux and other guest operating systems that currently are hosted
  38  * on Hyper-V. The implementation here conforms to this yet
  39  * unpublished guidelines.
  40  *
  41  *
  42  * Bit(s)
  43  * 63 - Indicates if the OS is Open Source or not; 1 is Open Source
  44  * 62:56 - Os Type; Linux is 0x100
  45  * 55:48 - Distro specific identification
  46  * 47:16 - Linux kernel version number
  47  * 15:0  - Distro specific identification
  48  *
  49  *
  50  */
  51
  52 #define HV_LINUX_VENDOR_ID              0x8800
  53
  54 /*
  55  * Generate the guest ID based on the guideline described above.
  56  */
  57
  58 static inline  __u64 generate_guest_id(__u64 d_info1, __u64 kernel_version,
  59                                        __u64 d_info2)
  60 {
  61         __u64 guest_id = 0;
  62
  63         guest_id = (((__u64)HV_LINUX_VENDOR_ID) << 56);
  64         guest_id |= (d_info1 << 48);
  65         guest_id |= (kernel_version << 16);
  66         guest_id |= d_info2;
  67
  68         return guest_id;
  69 }
  70
  71 void hyperv_callback_vector(void);
  72 #ifdef CONFIG_TRACING
  73 #define trace_hyperv_callback_vector hyperv_callback_vector
  74 #endif
  75 void hyperv_vector_handler(struct pt_regs *regs);
  76 void hv_setup_vmbus_irq(void (*handler)(void));
  77 void hv_remove_vmbus_irq(void);
  78
  79 void hv_setup_kexec_handler(void (*handler)(void));
  80 void hv_remove_kexec_handler(void);
  81 void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs));
  82 void hv_remove_crash_handler(void);
  83 #endif